varNDMI: Calculate the normalized difference moisture (water) index...

In RGISTools: Handling Multiplatform Satellite Images

Description

varNDMI computes the normalized difference moisture index (NDMI) from the near-infrared (NIR) and shortwave-infrared 1 (SWIR1) bands.

Usage

varNDMI(nir, swir1)

Arguments

nir	a raster with the nir band of the capture.
swir1	a raster with the swir1 band of the capture.

Details

The normalized difference moisture index (NDMI) is an index that represents the water stress levels of the canopy, using the NIR and SWIR \insertCitegao1995normalizedRGISTools. This function is used within ls7FolderToVar, ls8FolderToVar, modFolderToVar and senFolderToVar.

Value

A NDMI image in raster format.

References

\insertRef

gao1995normalizedRGISTools

Examples

# path to the cropped and cutted MODIS images for the region of Navarre
wdir <- system.file("ExNavarreVar", package = "RGISTools")
# list all the tif files
files.mod <- list.files(wdir, pattern="\\.tif$", recursive = TRUE, full.names = TRUE)
# print the MOD09 bands
getRGISToolsOpt("MOD09BANDS")

# select the NIR and SWIR1 bands
img.mod.nir <- raster(files.mod[2])
img.mod.swir1 <- raster(files.mod[6])
# calculate the NDMI image
img.mod.ndmi <- varNDMI(img.mod.nir,img.mod.swir1)
# plot the image
spplot(img.mod.ndmi)

RGISTools documentation built on July 2, 2020, 3:58 a.m.